// Copyright 2014 The Flutter Authors. All rights reserved. // Use of this source code is governed by a BSD-style license that can be // found in the LICENSE file. /// Flutter code sample for [AnimatedPositioned]. import 'package:flutter/material.dart'; void main() => runApp(const MyApp()); class MyApp extends StatelessWidget { const MyApp({super.key}); static const String _title = 'Flutter Code Sample'; @override Widget build(BuildContext context) { return MaterialApp( title: _title, home: Scaffold( appBar: AppBar(title: const Text(_title)), body: const Center( child: MyStatefulWidget(), ), ), ); } } class MyStatefulWidget extends StatefulWidget { const MyStatefulWidget({super.key}); @override State<MyStatefulWidget> createState() => _MyStatefulWidgetState(); } class _MyStatefulWidgetState extends State<MyStatefulWidget> { bool selected = false; @override Widget build(BuildContext context) { return SizedBox( width: 200, height: 350, child: Stack( children: <Widget>[ AnimatedPositioned( width: selected ? 200.0 : 50.0, height: selected ? 50.0 : 200.0, top: selected ? 50.0 : 150.0, duration: const Duration(seconds: 2), curve: Curves.fastOutSlowIn, child: GestureDetector( onTap: () { setState(() { selected = !selected; }); }, child: Container( color: Colors.blue, child: const Center(child: Text('Tap me')), ), ), ), ], ), ); } }